Carbonyl­chlorido(1-methyl­sulfanylpenta-1,3-dien-1-yl-5-yl­idene)bis­(triphenyl­phosphane)osmium(II)

The crystal structure of the title compound, [Os(C(6)H(7)S)Cl(C(18)H(15)P)(2)(CO)], confirms the formulation as an osmabenzene. There is a slightly distorted octa­hedral coordination environment at the Os(II) ion, with the triphenyl­phosphane ligands mutually trans and the chloride cis to the carbon bearing the –SMe substituent. Within the metallacyclic ring, the C—C distances are appropriate for aromatic bonds and the two Os—C distances are shorter than typical Os—C single bonds. The maximum deviation from the least-squares plane through the osmabenzene ring occurs for the carbon bearing the SMe substituent [0.1037 (18) Å].